Lock



E. N. JACOB! Aug. 7, 1934.

LOCK

3 Sheets-Sheet 2 Filed May 8, 1935 ww l/ Aug 7, 1934- E. N; JAcoB-l1,969,012

LOCK

Filed May 8, 1933 3 Sheets-Sheet 5 Patented Aug. 7, 1934 UNITED STATESPATENT oFF-ICE LOCK Edward N. Jacobi, Milwaukee, Wis., aignor to Briggs& Stratton Corporation, Milwaukee, Wis., a corporation of DelawareApplication@ s, 193s, serai Ne. ssass :somma (c1. 'zo-4s) lo a lock ofthe character described in which the and are practically independent ofthe casing sov that a close vfit between the lock cylinder and thecasing is obviated.

Another object of this. invention is to provide a tumbler lock having anauxiliary tumbler which can be retracted only after the other tumblershave been bodily shifted parallel to the major axis of the lockcylinder.

It is also an object of this invention to further increase the security'of the lock by providing means for preventing bodily shifting of themain tumblers until all of said main tumblers are fully retracted.

A furtherL object of this invention is to provide a tumbler constructionwhich will alford greater strength and having a wider engagement withthe walls of the casing tumbler grooves.

Another object or this invention is to provide a lock of the characterdescribed wherein the so that delicate thin wall sections in thetumbler.

receiving chamber of the lock cylindervare entirely done away with.

And a further object of this invention is to provide a lock in which a.final inward pressure must be applied to the key to free the lockcylinder for rotation. j

With the above and other objects in view which will appear as thedescription proceeds, my invention resides in the novel construction,combination and arrangement of parts substantially ashereinafterdescribed and more particularly decned by the appendedclaims, it being understood that such changes in' the precise embodimentof the hereindisclosed invention may be made as come within thescope ofthe claims.

In the accompanying drawings, I have illus- 50. trated one completeexample of the physical em- Figure 11s e. top view of a. leek cylinderembodying this invention and received in a casing; Figure 2 is a viewpartly in elevation and partly in section taken on the plane of the line2-2 of Fig.. 1;

Figure 3 is a cross section view taken through Fig. 2 on the plane ofthe line 3 3;

Figure 4 is a cross section view taken through Fig. 2 on the plane ofthe line 4.-4;

Figure 5 is a perspective view of the entire tumbler unit. with itscomponent parts sepa-l 5 rated: 1

Figure -6 is a cross section view 4similar to Fig. 3. but illustratingthe key in position; Figure 7 is a front end viewof only the tumblercarrier and the stationary side plate showing the manner in which thesetwo parts are slidably interlocked;

Figure 8 is a side view of the key;

Figure 9 is a perspective view of the lock cylinder and the tumbler unitseparated, but with the tumbler unit assembled and ready for insertioninto the lock'cylinder;

Figure 10 is a view similar to Fig. 2 showing the key inserted and themain tumblersv retractedf and Figure 11 is a view similar to Fig. 10,but showing the key pushed in and the auxiliary tumbler retracted.

Referring now more particularly to the accompanying drawings in whichlike numerals indi' cate like parts throughout the several views, thenumeral 5 represents a lock cylinder which is adapted' to be rotatablymounted in the bore 6 of a casing 7. An enlarged flange 8, formed on theouter end of the lock cylinder, is received in a counterbore 9 at theouter end o! the bore 6. It is observed that the lock cylinder hassubstantial clearance in the bore 6 throughout the major portion of itslength and that only a small portion 10 directly adjacent the enlargedilange 9 has a snug t in the bore. This comparatively large clearance ismade possible without detracting from the security of the lock by reasonof the novel construction of the tumbler unit indicated generally by thenumeral 11.

The tumbler unit which will be defined in detail hereinafter, isinserted bodily into a tumbler receiving chamber 12. extendingtransversely through the lock cylinder. The chamber 12 is merely an openslot formed during lthe die-casting of the cylinder by a single corewhich is pulled from one side. As is customary, a keyway 13 extendsinwardly from the front face of the cylinder to communicate with thechamber 12.

The tumbler unit 11 comprises a tumbler pack lll 14 including the fivemain tumblers 15, and an auxiliary tumbler 16 independent of the pack.The five main tumblers are held assembled by a carrier 17 stamped fromsheet metal and having spaced end walls 18 and 19 connected by a sidewall 20. The end walls are of a width to extend across the width of thetumbler receiving chamber 12. The carrier for the pack is thus heldagainst sidewise movement, but as the pack is shorter than the chamber12, endwise movement thereof parallel to the major axis of the lockcylinder is permitted, for a purpose to be later described.

Each of the ve main tumblers has a recess cut into it from one side toform spaced end portions 21 and 22 connected by an intermediate portion23. The space between the end portions 21 and 22 serves as a .recess toreceive a key 24, and in dierent tumblers is differently located to makeup the combination of the lock as determined by the hills and dales ofthe key.

At the side of each tumbler having the intermediate portion 23 is aprojecting lug 25 which is slidably received in one of a plurality ofslots 26 formed in the side wall 20. The slots 26 are longer than theprojecting lugs 25 so that the individual tumblers have a limitedlongitudinal movement with respect to the carrier. The engagement of thelugs 25 in the slots 26 serves to guide the tumblers at one side.

Inasmuch as the lugs 25 do not project entirely through the side wall 20of the carrier, it follows that the tumblers are held out of contactwith the adjacent die-cast wall of the lock cylinder. The projectinglugs 25 occupy the same position in all of the tumblers so that alltumblers have an equal distance of longitudinal trave1.

As stated, the engagement of the lugs 25 in the slots 26 guides thetumblers and holds them properly spaced along one side edge. At theiropposite sides the tumblers are guided and held properly spaced bylongitudinal abutting ribs 27. 'Ihe ribs 27 are of such dimensions thatthe combined thicknesses of the tumblers at the ribs 27 spans thedistance between the carrier end walls. Besides guiding the tumblers forindividual longitudinal movement these ribs 27 also stiflen thetumblers. The strength of the tumblers is also increased by spaced ribs28 and 29 formed at the sides of round bottomed longitudinal grooves 30in the opposite faces of the tumblers.

The round bottomed grooves 3G of adjacent tumblers co-act to formlongitudinal guideways in which expansive springs 31 are received. Atone end the springs 31 bear against. tangs 32 struck from the groovedportions of the tumblers and at their other ends they bear againstspring stops 33 struck inwardly from one edge of the carrier side wall20. The spring for each tumbler is at its front face so that the springfor the foremost tumbler is confined between the round bottomed groovein said foremost tumbler and the adjacent portion of the end wall 18. Toaccommodate this spring, the end Wall 18 has its upper portion offset,as at 34.

Obviously, the action of the springs 31 yieldably urges each individualtumbler to project its end portion 22 beyond the cylindrical surface ofthe lock cylinder and into locking engagement with one of two usualtumbler grooves 35 in the casing.

The open side of the carrier is closed by a side plate 36 which has aninterlocking connection with the end walls 18 and 19 of the carrier, but

when inserted into the chamber 12 of the lock cylinder, is heldstationary while the carrier and the main tumblers positioned thereinare movable as hereinbefore stated. This side plate 36 is stamped fromsheet metal and has inwardly directed flanges 37 and 38 at its oppositeside edges. The ange 37 projects into the spaces between the endportions 21 and 22 of the tumblers and forms a key guide and supportadapted to enter a longitudinal groove 39 formed in one side of the key.

The other flange 38 of the side plate 36 has a plurality of notches cutinto it to divide the same into a. series of comb teeth 40 which, whenthe carrier and the tumblers disposed therein are in their normalpositions, lie between the adjacent side edges .of the tumblers to thuspositively prevent bodily shifting of the tumbler pack. The end portions41 and 42 of the flange 38 are engaged with the carrier end walls 18 and19 respectively in a manner now about to be described.

The end wall 18 of the carrier has lts medial portion cut away as at 43to permit the passage of the key into engagement with the tumblers. Thisleaves spaced arms 44 and 44 spaced apart a distance to snugly receivethe adjacent end of the side plate. The other end wall 19 of the carrierisA also medially cut away, as at 45, leaving an overhanging arm 46which is notched, as at 47, to receive the flange end portion 42.Relative motion between the side plate 36 and the carrier is thusrestricted to the desired endwise shifting of the carrier.

With the side wall 36 properly assembled with the carrier, the entireassembly is inserted into the chamber l2 of the lock cylinder, theinsertion being effected through one side of the chamber, which forconvenience in description, may be considered the top. The side walls ofthe chamber 12 have shoulders 48 and 49 to engage the bottom edges ofthe side wall 20 and the side plate 36, respectively, to limit theinward movement of the assembly into the chamber and properly locate thetumbler pack within the cylinder.

As best shown in Fig. 5, the side plate 36 has projections 50 and 51 atits outer and inner ends,

respectively, and these projections are received in suitable recesses 52and 53,'respectively, at the ends of the chamber 12. The side wall 36 isthus rigidly held assembled with the lock cylinder, while the tumblerpack comprising the carrier and the five main tumblers, is shiftableendwise in the chamber 12.

An expansive spring 54 confined between the end wall 19 of the carrierand the end wall 55 of a recess 56 communicating with the inner edgesreceived in transverse grooves 57 formed is cut away as at 60 toaccommodate the spring 54.

The tumbler 16 is positively held in lts op.- erative projected positionas long as the tumbler pack is in its normal position of endwisemovement to which it is urged by the spring 54, by a cam or tail piece61, projecting rearwardly from the carrier wall 19 and entering acentral opening 62 in the tumbler 16. The cam 61 is preferably formed.by the metal struck from the wall 19 in the formation of the recess andhas a fiat outer end 63 which engages the bottom wall of the opening y62in its operative holding position. An inclined wall 64 leads upwardlyfrom the end 63 to move the tumbler 16 to its operative position duringforward endwise movement of the tumbler pack.

It is thus obvious that retraction of the tumble 16 out of lockingengagement with the groovethe inter-engagement of the comb teeth 40 withthe adjacent side edges of the tumblers. These side edges of thetumblers have notches 65 which, when aligned with the ilange 38 fromwhich comb teeth 40 are out, releases the pack for endwise shifting toenablecomplete release of the lock cylinder. Endwise shifting of thetumbler pack is thus possible only when all of the primary4 tumblers arecompletely retracted.

Inward pressure on the key effects the desired shifting of the tumblerpack and for this purpose the key is provided with a shoulder 66 whichengages the rib 27 of the foremost tumbler as best shown in Figs. 9 and10. Inasmuch as the ribs 27 of the primary tumblers are in abuttingrelation, the force applied through the shoulder 66 is transmitteddirectly to all of the tumblers and to the carrier in which they aremounted.

When the key has been inserted suillciently far to retract all of theprimary tumblers and to engage its shoulder 66 with the rib 27 of theforemost tumbler, the nose 67 of the key projects beyond the inner endof the carrier into the central opening 62 in the tumbler 16. Therelative positions of the nose of the key and the tumbler 16 at thisstage of the unlocking action are shown in Fig. 10. Upon endwiseshifting of the tumbler pack by pressure on the key, the

yinclined edge of the nose 67 engages the top wall of the opening 62 inthe tumbler and lifts the same to unlocked position.

Upon release of the inward pressure on the key, the spring 54 willimmediately return the tumbler pack to its normal position,automatically moving the auxiliary tumbler 16 to its locked positionthrough the medium of the cam 61.

From the foregoing description, it will be apparent to those skilled inthe art to which this invention appertains, that to pick the lockof thisinvention, is extremely diilicult, if not impossible. The fact that theauxiliary tumbler is positively held in its locked position until thetumbler pack has been endwise and the necessity for the retraction ofall of the primary tumblers comprising the pack before' such endwiseshifting of the pack can take place. makes it practically impossible topick the lock.

l Moreover, by reason of the fact that a singlew ember. namely. the sideplate 36, serves to guide the key and also engages the tumblers toprevent endwise shifting of the pack, and the further fact that theengaging portions of the comb teeth and the tumblers have sharp acutecorners. precludes the response of the lock to a key which differs, butslightly from the proper key.

The primary tumblers thus perform duel locking functions, the firstbeing their normal locking engagement withthe casing tumbler grooves andthe second being effected through their interengagement with the combteeth of the vside plate It is also apparent that by reason of the wideedges of the tumblers,vwearing into the casing Agrooves is materiallyminimized and through the provision of the sheet metal linings affordedby the side wail 20 of the carrier and the side plate 36, wearing of thetumblers into their guides is reduced to a negligible minimum.

It is also evident that as all parts concerned with the security of thelock are self-contained in the cylinder assembly, the picking protectionand the protection between changes does not depend upon a close lfitbetween thecylinder and its casing. Hence, a greater clearance ispossible between the cylinder and its casing so that-sticking andcorrosion due to excessive friction is entirely obviated.

What I claim as my invention is:

1. In a lock, a casing, a lock cylinder rotatable in the casing, aplurality of locking tumblers in the lock cylinder yieldably projectedinto engagement with the casing to restrain rotation of the lockcylinder, means to mount one of said locking tumblers for bodilymovement axiall to the lock cylinder, said axially movable lockingtumbler being retractable by the insertion of a proper key into the lockcylinder and the other locking tumbler being retractable upon bodilyshifting of said first mentioned locking tumbler axially to thelockcylinder by continued inward pressure on the key.

2. In `a lock device including a lock cylinder, a plurality of lockingtumblers, a carrier axially shiftable within the lock cylinder andholding the plurality of tumblersas an assembled pack, said tumblersbeing retractable by the insertion of a -proper key into the lockcylinder and being shiftplurality of tumblers as an assembled pack, saidtumblers being retractable by the insertion of a proper key into thelock cylinder and being shiftable with their carrier upon inwardmovement of the key beyond that required to retract the tumblers, anauxiliary tumbler retractable into the body of the cylinder by saidvadditional inward movement of the key, and means on said carrier tohold the auxiliary tumbler in an operative position when the carrier isin its normal tumblers therein being shiftable axially of the lockcylinder within'said chamber, means to yieldably urge the tumbler packtoward one position of axial movement, said tumblers being retractableby the insertion of a proper key into the lock cylinder, and the entirepack being shiftable against the urging means upon inward movement ofthe key beyond that required to retract the tumblers, an auxiliarytumbler, and a cam on the carrier engaging the auxiliary tumbler to holdthe same in its operative extended position when the tumbler pack is inits normal position,

said auxiliary tumbler being retractable upon axial shifting of thetumbler pack by said additional inward movement of the key.

5. In a lock, a lock cylinder having a tumbler receiving chamber, aplurality of tumblers, a carrier for the tumblers to hold the sameassembled as a unitary pack, said carrier with the tumblers thereinbeing shiftable axially of the lock cylinder within said chamber, meansto yieldably urge the tumbler pack toward one position of axialmovement, said tumblers being retractable by the insertion of 'a properkey into the lock cylinder, and the entire pack being shiftable againstthe holding means upon inward movement of the key beyond that requiredto retract the tumblers, an auxiliary tumbler, a cam. on the carrierengaging the auxiliary tumbler to hold the same in its operativeextended position when the tumbler pack is in its normal position, saidauxiliary tumbler being retractable upon axial shifting of the tumblerpack by said additional inward movement of the key, and means to preventaxial shifting of the tumbler pack except when all of the tumblerscomprising the pack are in their fully retracted positions.

6. In a lock, a lock cylinder having a tumbler receiving chamber, atumbler pack in said chamber comprising, a plurality of tumblers and acarrier to hold said tumblers assembled, said tumbler pack being bodilyshiftable axially of vthe lock cylinder, means to yieldably oppose axialshifting of the tumbler pack in one direction and to hold the pack in anormal position, means engageable with the tumblers when the -pack is inits normal position to prevent axial shifting of the pack except when`all of said tumblers are retracted, said tumblers being retractable bythe insertion of a, proper key, and an auxiliary tumbler retractable bythe axial shifting of the tumbler pack by said proper key.

7. In a lock, a lock cylinder having a tumbler receiving chamber, atumbler pack comprising a plurality of tumblers and a. carrier holdingthe tumblers assembled, said tumbler pack being shiftable axially of thelock cylinder Within its tumbler receiving chamber, a member fixed withrespect to the lock cylinder and having engagement with the individualtumblers to prevent axial shifting of the tumbler pack except when allof said tumblers are retracted, said tumblers being retractable by theinsertion of a proper key into the lock cylinder to engage the tumblers,and the tumbler pack being axially shiftable by inward pressure on thekey, and means on said fixed member to guide the key.

8. In a tumbler lock including a casing and a lock cylinder receivedtherein, a plurality of tumblers carried by the lock cylinder andyieldably projected into locking engagement with the casing to hold thelock cylinder against rotation, said tumblers being retractable by a.proper key to free the lock cylinder for rotation, means to preventretraction of one tumbler until another tumbler has been shifted bodilyin a line parallel to the major axis of the lock cylinder, and means toprevent such bodily shifting of said other tumbler until it has beenretracted.

9. In a tumbler lock including a casing and a lock cylinder receivedtherein, a plurality of tumblers carried by the lock cylinder andyieldably projected into locking engagement with the casing to hold thelock cylinder against rotation, said tumblers being retractable by aproper key to free the lock cylinder for rotation, means connected witha first tumbler and engagcable with a second tumbler to hold said secondtumbler against retraction until the rst tumbler and said meansconnected with it has been shifted axially with respect to the lockcylinder, and means to prevent such bodily shifting of said firsttumbler and the means connected with it until said rst tumbler has beenretracted.

10. In a tumbler lock including a casing and a lock cylinder receivedtherein, a plurality o@ tumblers carried by the lock cylinder andyieldably projected into locking engagement with the casing to hold thelock cylinder against rotation, all of said tumblers being retractableinto the body of the cylinder by a proper key to free the lock cylinderfor rotation, and means requiring successive retraction and bodilyfiatwise shifting of one tumbler to retract another tumbler.

l1. In a tumbler lock including a casing and a lock cylinder receivedtherein, a plurality of tumblers carried by the lock cylinder andyieldably projected into locking engagement with the casing to hold thelock cylinder against rotation,

all of said tumblers being retractable into the body of the cylinder bya proper key to free the lock cylinder for rotation, means to hold someof said tumblers assembled as a unitary pack, and means requiringsuccessive retraction of the tumblers comprising the pack and a bodilyshifting of the pack axially to the lock cylinder to retract another ofsaid tumblers.,

12. In a tumbler lock including a casing and a lock cylinder therein,said lock cylinder having a transverse tumbler receiving chamber, atumbler pack mounted in said chamber so as to have bodily movementparallel to the major axis of the lock cylinder, said tumbler packembodying a plurality of tumblers each individually spring pressed intolocking engagement with the casing and all retractable by a proper key,an auxiliary tumbler separate from said pack, said auxiliary tumbleralso being retractable into the body of the cylinder and a connectionbetween the auxiliary tumbler and said pack whereby axial shifting ofthe pack is necessary to allow locking retraction of said auxiliarytumbler.

13. In a tumbler lock including a casing and a lock cylinder therein,said lock cylinder having a transverse tumbler receiving chamber, atumbler pack mounted in said chamber so as to have bodily movementparallel to the major axis of the lock cylinder, said tumbler packembodying a plurality of tumblers each individually spring pressed intolocking engagement with the casing and all retractable by a proper key,an auxiliary tumbler separate from said pack, a connection between theauxiliary tumbler and said pack whereby axial shifting of the pack isnecessary to allow locking and unlocking movement of the said auxiliarytumbler, and means restricting axial shifting of the pack until thetumblers of the pack have been retracted.

14. In a tumbler lock including a lock cylinder, a tumbler unit insertedbodily into an aperture against endwise shifting except when thetumblers are retracted by the insertion of a proper key.

26. In a key controlled tumbler lock', a lock cylinder having a tumblerreceiving aperture, a plurality of tumblers in said aperture, a sideplate disposed between one side of the tumblers and the adjacent wall ofthe tumbler receiving aperture, said tumblers being retractable toinoperative position by a proper key and being shiftable in unison forthe purpose`set forth, means on said side plate and engaging the lockingtumblers to prevent such shifting except when all of the tumblers arecompletely retracted by a proper key, and means on said side plateforming a guide and support for the key to insure a denite position ofthe key with respect to the means for preventing the shifting of thetumblers -so that only the proper key will free the locking tumblers forshifting. g

27. In a key controlled tumbler lock including a lock cylinder having atumbler receiving aperture, a tumbler unit in said aperture including anauxiliary tumbler, and means requiring bodily shifting of the othertumblers towards the auxiliary tumbler to free the auxiliary tumbler forretraction, and a single member to restrain such shifting of said othertumblers except when said other tumblers are fully retracted and tosupport and guide the key required to effect complete retraction of saidother tumblers.

28. In a key controlled tumbler lock including a lock cylinder having atumbler receiving aperture, a tumbler unit in said aperture comprising aplurality of tumblers, the retraction of one of which requires bodilyshifting of the other tumblers in av direction at an angle to the normallocking and unlocking movements of the tumblers, a member having combteeth projected into the spaces between said shiftable tumblers to holdsaid tumblers against shifting, and said shiftable tumblers havingnotches to be aligned with said comb teeth upon retraction of saidshiftable tumblers to inoperative positions by a proper key to free saidshiftable tumblers forthe required shifting movement.

29. In a tumbler lock, a lock cylinder having transverse tumblerreceiving recess, a tumbler mounted in said recess to be movedlongitudinally to and from a position having one end projecting beyondthe cylindrical wall of the cylinder and flatwise in a directionparallel with the axis of the cylinder during the unlocking of the lock,an abutment engageable with said tumbler to hold the same against atwisemovement as long as the tumbler is in any position other than fullyretracted within the body of the cylinder, and the tumbler having anotch to be aligned with said abutment upon retraction of the tumbler toan inoperative position within the cylinder to free the tumbler foratwise movement.

30. A tumbler for locks comprising, a substantially at plate having alarge recess opening to one side edge to divide the tumbler into spacedend portions, connected by a medial portion and having a notch in one ofits end portions, the recess being adapted to receive a key and thenotch being adapted to permit the passage therethrough of a restrainingabutment to free the tumbler for flatwise movement.

31. In a key controlled tumbler lock including a plurality of tumblers,each having a key receiving recess opening to one side and a notch in anunrecessed portion of the tumbler and opening to the same side at whichthe recess opens, a member disposed along said side 0f the limblers towhich the recesses and notches open. a plurality of abutments ony saidmember engaging lthe tumblers to hold the same against atwise shifting,said abutments being passable through the notches in the tumblers whenthe tumblers are retracted to their inoperative positions by a properkey, and means on said member to guide and support the key to insureproper alignment of the notches with the abutments.

32. In a tumbler lock having a lock cylinder, a tumbler in said lockcylinder, a holding member engaged with the tumbler to prevent itsretraction, said holding member being movable to free the tumbler forretraction, and key controlled means to prevent movement of the holdingmember.

33. In a tumbler lock including a lock cylinder having a tumblerreceiving aperture, a tumbler in said aperture movable transversely ofthe lock cylinder to and from an operative position with one endprojecting from the lock cylinder, a holding member in said aperturenormally engaged with said tumbler to hold the same in its projectedoperative position, said holding member being movable toward the tumblerto free the tumbler for retraction from its operative position, and keycontrolled means to prevent such movement of the holding member.

34. In a tumbler lock including a lock cylinder having a tumblerreceiving aperture, a'tumbler mounted in said aperture for transversemovement to and from an operative position projecting one end beyond thecylindrical wall of the lock cylinder, a member slidably mounted in theaperture for movement toward and away from said tumbler, means on saidmember engaging the tumbler to hold the same in its operative projectedposition, said member being movable by a proper key to free the tumblerfor retraction from its operative position and said tumbler beingengageable by the key to be retracted upon movement of said member bythe key, and means to prevent movement of said member, said last namedmeans being disabled by the key.

35. In a tumbler lock including a lock cylinder having a tumblerreceiving aperture, an auxiliary tumbler mounted in said aperture formovement transversely to the axis of the lock cylinder to and from anoperative projected position, a member slidably disposed in the aperturefor movement toward and away from said auxiliary tumbler in a directionsubstantially parallel to the major axis of the lock cylinder, meanscarried by said member and engaging the auxiliary tumbler to hold theauxiliary tumbler in its operative projected position when said memberis in one position of movement, movement of said member to anotherposition releasing the auxiliary tumbler for retraction, and a pluralityof primary tumblers connected with said member and operable in theirnormal positions to prevent movement of said member, said primarytumblers being retractable to free the member for movement by a properkey, and said member and auxiliary tumbler being respectively movableand retractable by said same key.

36. In a tumbler lock including a lock cylinder having a transverseaperture for the reception of tumblers, an auxiliary tumbler mounted inone end of the aperture for movement to and from an operative positionprojecting one end out of the aperture, a tumbler pack slidable in theaperture toward and away from said auxiliary tumbler and comprising acarrier having spaced end walls connected by a side wall and a pluralityof primary tumblers assembled in said carrier, a cam projected from oneend wall of the carrier to engage in an opening in the auxiliary tumblerand hold the auxiliary tumbler in its projected operative position whensaid carrier isl at one limit of movement and freeing the auxiliarytumbler for retraction upon movement out of said position, and meansfixed with respect to the lock cylinder and engaged with the primarytumblers requiring complete retraction of said primary tumblers to freethe carrier for such movement.

37. In a tumbler lock including a lock cylinder, an auxiliary tumblertransversely movable in said lock cylinder, a tumbler pack movableendwise in said lock cylinder toward and away from the auxiliary tumblerand comprising a carrier and a plurality of primary tumblers eachindividually yieldably projected to operative position, a connectionbetween said auxiliary tumbler and the tumbler pack, whereby bodilyendwise movement of the tumbler pack toward the auxiliary tumbler isnecessary to free the auxiliary tumbler for retraction, and means toprevent endwise movement of the tumbler pack except when the primarytumblers comprising the pack are retracted, said primary tumblers beingretractable by a proper key inserted therethrough to free the pack formovement, and the auxiliary tumbler being retractable by the nose of thekey which projects from the tumbler pack into engagement with theauxiliary tumbler.

38. In a tumbler lock including a lock cylinder, an auxiliary tumblermounted in the lock cylinder for transverse movement to and from anoperative position projecting one end beyond the cylindrical surface ofthe lock cylinder, a tumbler pack movable endwise in the lock cylindertoward and away from said auxiliary tumbler and comprising a pluralityof primary tumblers and a carrier to hold the primary tumblersassembled, means to yieldably urge the pack away from the auxiliarytumbler, a cam carried on said carrier and engaged with the auxiliarytumbler to move the auxiliary tumbler to its operative projectedposition upon movement of the pack under influence of the yieldablemeans and to hold the auxiliary tumbler in its operative projectedposition as long as the pack is in its normal position to which it isurged by the yieldable means, and means to lock the pack in said normalposition to which it is moved by the yieldable means.

EDWARD N. JACOBI.

